Buggy code:
public class CorrectnessAnalysis extends AbstractAnalysisClass { private static Logger log = Logger . getLogger ( CorrectnessAnalysis . class ) ; private String listsentences = "" ; public CorrectnessAnalysis ( Language lang ) { } public AnnotatedCollaborativeContentAnalysis check ( CollaborativeContentAnalysis collaborativeContentInput ) { } public AnnotatedStaticContentAnalysis check ( StaticContentAnalysis staticContentInput ) { } private int calculateAnnotations ( String sentence , List < RuleMatch > matches , Content c , Integer id , List < Annotation > annotations , int offset ) { int precedentposition = 0 ; int finalpos = 0 ; Annotation prev = new Annotation ( ( - 1 ) , "" , ( - 1 ) , ( - 1 ) , "" ) ; for ( RuleMatch match : matches ) { String stringa = sentence . substring ( match . getFromPos ( ) , match . getToPos ( ) ) ; if ( ! ( stringa . isEmpty ( ) ) ) { if ( Character . isUpperCase ( stringa . charAt ( 0 ) ) ) { continue ; } else { try { String prestringa = sentence . substring ( ( ( match . getFromPos ( ) ) - 1 ) , match . getFromPos ( ) ) ; String poststringa = sentence . substring ( match . getToPos ( ) , ( ( match . getToPos ( ) ) + 1 ) ) ; boolean flag = ( ( prestringa . contains ( "“" ) ) || ( poststringa . contains ( "”" ) ) ) || ( ( prestringa . contains ( "\"" ) ) || ( poststringa . contains ( "\"" ) ) ) ; if ( flag ) { continue ; } } catch ( Exception e ) { } } } if ( precedentposition >= ( match . getFromPos ( ) ) ) { precedentposition = match . getFromPos ( ) ; } else { String stringap = sentence . substring ( precedentposition , match . getFromPos ( ) ) ; listsentences += stringap ; } <START_BUG> if ( ( match . getToPos ( ) ) != ( ( prev . getNodeStart ( ) . getOffSet ( ) ) - offset ) ) { <END_BUG> c . setContent ( listsentences ) ; listsentences = "" ; id ++ ; Node init = new Node ( id , ( ( match . getFromPos ( ) ) + offset ) ) ; c . setContent ( init ) ; precedentposition = match . getToPos ( ) ; c . setContent ( stringa ) ; id ++ ; Node end = new Node ( id , ( ( match . getToPos ( ) ) + offset ) ) ; c . setContent ( end ) ; Annotation a = new Annotation ( ) ; a . setId ( id ) ; a . setEndNode ( end . getId ( ) ) ; a . setStartNode ( init . getId ( ) ) ; a . setNodeEnd ( end ) ; a . setNodeStart ( init ) ; a . setType ( "Correctness" ) ; a . setRecommendation ( ( ( ( getSuggestion ( match . getMessage ( ) ) ) + ( Messages . getString ( "CorrectnessAnalysis.Reccomandation" , language ) ) ) + ( match . getSuggestedReplacements ( ) ) ) ) ; annotations . add ( a ) ; prev = a ; id ++ ; finalpos = match . getToPos ( ) ; } else { id ++ ; Annotation a = new Annotation ( ) ; a . setId ( id ) ; a . setEndNode ( prev . getNodeEnd ( ) . getId ( ) ) ; a . setStartNode ( prev . getNodeStart ( ) . getId ( ) ) ; a . setNodeEnd ( prev . getNodeEnd ( ) ) ; a . setNodeStart ( prev . getNodeStart ( ) ) ; a . setType ( "Correctness" ) ; a . setRecommendation ( ( ( ( getSuggestion ( match . getMessage ( ) ) ) + ( Messages . getString ( "CorrectnessAnalysis.Reccomandation" , language ) ) ) + ( match . getSuggestedReplacements ( ) ) ) ) ; annotations . add ( a ) ; prev = a ; id ++ ; finalpos = match . getToPos ( ) ; } } if ( ( annotations . size ( ) ) == 0 ) { listsentences += sentence ; } else { if ( finalpos < ( sentence . length ( ) ) ) { listsentences += sentence . substring ( finalpos , sentence . length ( ) ) ; } } return id ; } public int getNumSentenceDiffected ( ) { } public CorrectnessAnalysis ( Language lang , CollaborativeContentAnalysis collaborativeContentInput ) { } public CorrectnessAnalysis ( Language lang , StaticContentAnalysis staticContentInput ) { } public void run ( ) { } private String getSuggestion ( String a ) { } }

Fix:
if ( ( match . getFromPos ( ) ) != ( ( prev . getNodeStart ( ) . getOffSet ( ) ) - offset ) ) {